SB2026050225 - Improper input validation in Linux kernel btrfs

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Main Vulnerability Database SB2026050225

SB2026050225 - Improper input validation in Linux kernel btrfs

Published: May 2, 2026

Security Bulletin ID SB2026050225
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-43046)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper input validation in the btrfs root item handling and relocation recovery code when mounting a btrfs filesystem containing corrupted metadata. A local user can mount a crafted filesystem image to cause a denial of service.

The issue is triggered during relocation recovery at mount time when a root item contains a non-zero drop_progress.objectid together with a zero drop_level.


Remediation

Install update from vendor's website.

References